Brake mechanism.



W. H. DOUGLAS.

7 BRAKE MECHANISM.

APPLI" 'TION TILED 00T.16, 1911.

Patented June 23, 1914.

TED @T WILLIAM H. DOUGLAS, OF BELLEVILLE, IIEN JERSEY, ASSIG1\TOR TO HEALE'E' COMPANY, OF NEW YORK, N. '55., A. CORI GEATION G NEW YGRK.

BRAKE i'tsceamsm.

Specification of Letters Patent. Fatwigfj Ju {33 Application filed October 16, 1911. Serial No. G5397.

' To all whom it may concern:

Be it known that I, WILLIAM H. DOUG- LAS, a citizen of the United States, and resident of Belleville, in the county of Essex and State of'New Jersey, have invented a new and useful Improvement in Brake.

Mechanisms, of which the following is a specification.

This invention relates to brake inecha= is represented in the accompanying drawings, in which- Figure 1 represents a portion of a vehicle wheel in side elevation embodying my in-' vention, Fig. 2 is a transverse section through the same showing enough of the adjacent parts to clearly understand the construction, form and operation of my invention, Fig. 3 is a section taken in the plane of the line -AA of Fig. 2, showing the divided brake band in its contracted or released position, and Fig. 4 is a detail section similar to Fig. 3, showing the brake band in its expanded or braking position.

The axle herein shown is of the dro 7 type, the lower horizontal portion being enoted by 1, the uprising arm by 2 and the laterally extended spindle by 3. The hub of the wheel which is shown journaled upon the spindle 3 of the axle is provided with an inner cylindrical braking surface on its laterally extended outer flange 5, The uprising arm 2 of the drop axle is shown as provided with a bracket 6 uprising therefrom and removably secured thereto, which bracket serves the double purpose of a mounting for the vehicle spring 7 and as a support for the pivot bolt 8 of the brake band, which pivot bolt projects into the interior of the outer flange 5 of the hub of the Wheel adjacent to the inner cylindrical braking sur- 1 face at the to thereof. A rock shaft 9 of the brake mechanism is journaled in a sleeve 9* extending through the uprising arm 2 of the drop frame, which rock shaft has the usual arm 10 for attachment to the rod 11 leading to the shaft rocking means not shown herein.

The internal brake band is hereinshown as divided into two semi-cylindrical merehers 12, 13, pivoted at their upper ,ends'to the bolt 8, between the retaining circunifer ential flanges 8*, 8*", their lower freeends being provided with Vertical parallel stirfaces 14, 15, the surface 14 having at its upper end a flange- 16 and the surface 15 having at its lower end a flan e 17, said flanges forming keepers for the siidaiale block to be hereinafter described. rock shaft 9 projects inwardly into-the interior of the flange 5 of the .hub adjacent to the inner cylindrical brain surface at the bottom of the said flange iametrleslly opposite the the rock sha t 9 is interposed between the free ends of the members 12 and 13 of divided brake band.

A islidable block 18 is carried by the rock shaft 9 in the present instance by providing a slot leading diametrically through said rock shaft Within which the block 18 has an easy sliding fit, with the opposite ends of said block projecting a distance beyond the periphery of the-said rock: shaft, The free ends of this slidabie block 18 engage the parallel vertical surfaces 14, 15, a e free ends of the members 1213 th divided brake band.

When the parts are in their nors alfposition, the opposite ends'of the slidshi block 18 are located in thecorners forms by the intersections of the parallel 14, 15, with the inner faces of the keepers 16, 17. I provide the rock shaft 9 "with a spool 19, the flanges 20, 21, of which are located upon the opposite sides of the free ends of theqnembers of the divided hand and serve to prevent any, lateral movement thereof. The slidable block 18 also projects through the body portion of said spool 19.

The brake band is normally held in its The jpivot bolt 8. This portionof 1' mntracted or'released position by coil :1 horizontal position will. expand the hralze hand into its braking ehgigement with the flange against the tension of the springs 22: 23 and the movement of the reel: shaft in a direct-ion toswing the slideoie block toward a vertical position will permit the brake bend to be brought into its contracted or released position by said springs.

The expanding brake band and its operating mechanism are housed Within the flange 5 and protected-from exposure 'to the elements, dust, dirt or other foreign mat ter, by providing a cap 24-, the circumferential flange 25 of which overlaps the flange 5 of the hub. This cap 24 has a central opening through which the spindle 8 of the axle projects. It also has openings through which the pivot bolt 8 and the rock shaft 9 project. The cap is secured to laterally extended arms 26, 27, of the bracket 6 by bolts 28, 29. It is also secured at the roclc shaft 9 between the flange 20 of the spool 19 and a nut 30 having a screw threaded engagement With the sleeve 9 By supporting the divided brake hand from the drop axle and bracket, the Wheel ma he removed and in serted without disturiiing the brake band and. its operating parts. siidoble block 18 serves to tie the spool. onto the rock shaft and the rock shaft against longitudinal movement and the free ends of the Blake hand against iateral movement.

It will be seen that the mounting of the rock shaft 9 in the uprising portion 2 of the drop axle provides a rigid and strong beering for the said rock shaft. It W111 also be seen that by the use of the siidahle block 18, the wear upon the brake band will not aitect its braking action and aiso that the sliding movement of the block will permit it to cquhlize its effort upon both oi: the man bers of the divided brake hand and thereby insure a continuous and even braking efi'eot upon the flange 5. It will. also be seen that any rattling of the brake i'nechenisn is ohviated by reason of the factthot the sprisgs 22, 23, hold the free ends of the slidahle block in the v diagonally opposite corners formed in the free ends of the brake band ineinloers.

It is evident that various ehangos might be resorted to in the form, construction and arrangement of the several. parts without departing from the spirit mid scope (f 111v invention; hence I do not Wish to titnit ni seli strictly to the'structure h rein set forth but Furthermore, the

u brake mechanism, :3 cylindrical braking surface, s divided brake hands, it och shaft interposedbetween the itee ends 4e band members a spool on said shat; having it flanges o erlapping the ends of the brake band members for holding them in position and a bioclt siioh shle transversely through elined slots in the rock shaft and spool and engzthing said Free ends of the brake band members.

lo. a brake mechanism, a cylindrical braking surface, a divided hrslie rock shaft interposed between the free of the hralte band members, e spooi. on said rock shaft, having its fiahges ovetiapping the ends of the brake hand. members holding them in position and a biOCi' slidahle transverseiy through alined sic-ts in. the rock: shaft and spool and engaging free ends of the brake band members, saidsiidable block serving to look the spool to the shaft.

3. In a brake mechanism, a fiyiintilififli braking surface, ii (iii ded hrelte hon rock shaft intesposed between the time of the brake band members, a spooi on and rock shaft, having its flanges overiajp retaining them in position and a, bio I sl d ahie through aiined slots in. the rose. yo", and spool and said free ends (lot the brake band members, said s'iif'ahie hioch serving to lock the rock shaft io tudinat movement and. the spool to the shaft and thereby hold the free ends oi hialte hand against iatei'ai movement In a brake mechanism, e cyiindiriosl Viitnesses F. i'EOItGE Essex; 

